BBC Cam suggestions .. ?
Thread Starter
Burning Brakes
Joined: Oct 2002
Posts: 914
Likes: 14
From: Aberdeen, Scotland
BBC Cam suggestions .. ?
I am looking to rebuild my LS-5. I'll have ported stock Oval 71 heads, stage II or III. Ported intake and exhaust manifolds. A reworked Q-jet, with maybe ~ 850 cfm. All this with a 3.70 rear and a 4 speed. I might go with a 4.25" stroker crank, depending on $$.
Any ideas on a Hyd. roller cam? I like the Voodoo line and a few crower and crane grinds.
carbster
Any ideas on a Hyd. roller cam? I like the Voodoo line and a few crower and crane grinds.
carbster
Burning Brakes
Joined: Feb 2005
Posts: 894
Likes: 91
1972 LS5 BB Resto
We're in the process of doing the (same) engine for a '72 Chevelle convertible. It'll be a 4 speed car. We've made the engine into a 496". We expect to see somewhere between 475/500HP with power brakes being functional. The engine is being assembled at this time and scheduled for the dyno in 2 weeks. We chose a Comp retro-hydraulic for a nitrous application due to the fact of the small exhaust valves and add'l exhaust duration. This will be a first time build on this platform. The cam we chose is the Comp Cams 11-409-8 (224/236 x .540/.550 x 113LS). We'll find out if we're right. We cant use any vacuum cans due to originiality. The engine will be tested with all the customer's "right" components, oval ports, cast intake, Q-jet, and cast exh. manifolds.
Thanks, Gary in N.Y.
P.S. The engine will have 9.75:1 C.R., 2.190" intakes(which were preinstalled, we would have left the 2.065"s in place), 1.720" exhausts, and a set of 1320 Comp pro-magnum rockers.
Thanks, Gary in N.Y.
P.S. The engine will have 9.75:1 C.R., 2.190" intakes(which were preinstalled, we would have left the 2.065"s in place), 1.720" exhausts, and a set of 1320 Comp pro-magnum rockers.
Last edited by GOSFAST; Sep 15, 2005 at 07:30 AM.
Thread Starter
Burning Brakes
Joined: Oct 2002
Posts: 914
Likes: 14
From: Aberdeen, Scotland
same story..
I am looking to build pretty much the same type of motor as your 72 Chevelle.
What crank did you use and why?
I like the spec on that cam. Is it a roller? My parts will be ported and should flow good. Therefore I believe that cam will work well. What was the duration @ 0"?
My builder will only use a roller cam on a BBC!
carbster
What crank did you use and why?
I like the spec on that cam. Is it a roller? My parts will be ported and should flow good. Therefore I believe that cam will work well. What was the duration @ 0"?
My builder will only use a roller cam on a BBC!
carbster
Drifting
Joined: Nov 2001
Posts: 1,469
Likes: 6
From: 68 427 4.11s Roadster
Your asking for cam advice but not giving the use.
What do you want out of it?
I have a non roller hydralic cam 11-313-4 .544" lift 276/284 adv. duration.
This is a mid to lower mid cam. around 230s/240s
I did put in a torquer rv cam and it was too much. Broke traction around corners way too easily.
Bottom feeder cam.
carbster09 Although I like roller cams I don't like the price. If your serious about the builder I would get a different one. Any builder should be building your engine the way you want.
Now if this guy is so set on roller cams why are you asking here and not using his knowledge?
What do you want out of it?
I have a non roller hydralic cam 11-313-4 .544" lift 276/284 adv. duration.
This is a mid to lower mid cam. around 230s/240s
I did put in a torquer rv cam and it was too much. Broke traction around corners way too easily.
Bottom feeder cam.
carbster09 Although I like roller cams I don't like the price. If your serious about the builder I would get a different one. Any builder should be building your engine the way you want.
Now if this guy is so set on roller cams why are you asking here and not using his knowledge?
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
If you will be running around 9:1 compression, the Comp Cams XR282HR hydraulic roller looks like a good choice.
I have a modified LS-5 and with our heads, more lift than .520 and you'll need to flycut the pistons and cut the valve guides down.
I have a modified LS-5 and with our heads, more lift than .520 and you'll need to flycut the pistons and cut the valve guides down.
Thread Starter
Burning Brakes
Joined: Oct 2002
Posts: 914
Likes: 14
From: Aberdeen, Scotland
Mid range power with good bottom end
I plan on running 9.5 CR. These cams seem to be quite good. I just wanted to ask if anyone has experience with putting various cams. We all have a favorite. I am just looking for great mid range power with enough low end grunt. Let's face stock is a little "sorry".
There are a few Lunati/Voodoo profiles that I liked. Hence I figured I would ask if anyone has used them. The guy that will be putting it all together does mostly "stock" or close to stock rebuilds as its a corvette only shop. However the shop has had a number of cam failures, therefore the roller cams are perferred. Not a problem for me as I like the idea of getting rid of all of that friction etc.
carbster
There are a few Lunati/Voodoo profiles that I liked. Hence I figured I would ask if anyone has used them. The guy that will be putting it all together does mostly "stock" or close to stock rebuilds as its a corvette only shop. However the shop has had a number of cam failures, therefore the roller cams are perferred. Not a problem for me as I like the idea of getting rid of all of that friction etc.
carbster
Drifting
Joined: Nov 2001
Posts: 1,469
Likes: 6
From: 68 427 4.11s Roadster
My cam is pretty much what your looking at. The only thing I don't like is it seems to run out of steam at 3.5 grand? A bit below? Gears are diff and your heads are probably better.
Up to that its pulling pretty good its a relative thing to some extent. It was pulling and now its pulling less.
Still this is like 98% of my driving and even horsing the gears on an on ramp I'm over the speed limit anyway.
Its enough to skip 2nd and 3rd in most street driving. I can almost do 35 in 4th since 35 don't really exist in the real world....
With your heads and rollers I think it will be much more on the higher end & mid.
Up to that its pulling pretty good its a relative thing to some extent. It was pulling and now its pulling less.
Still this is like 98% of my driving and even horsing the gears on an on ramp I'm over the speed limit anyway.
Its enough to skip 2nd and 3rd in most street driving. I can almost do 35 in 4th since 35 don't really exist in the real world....
With your heads and rollers I think it will be much more on the higher end & mid.
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Advanced
Joined: Sep 1999
Posts: 87
Likes: 0
From: Yazoo City MS
St. Jude Contributor
Crane custom hyd.roller
256/264 duration at .050"
.632"/.632" lift with 1.7 rockers
114 degree lobe separation
Jesel SS shaft rocker system, BBC 1.7 ratio
Callies Pro Magnum 4.250” crankshaft
peaks at 6300 rpm
256/264 duration at .050"
.632"/.632" lift with 1.7 rockers
114 degree lobe separation
Jesel SS shaft rocker system, BBC 1.7 ratio
Callies Pro Magnum 4.250” crankshaft
peaks at 6300 rpm
Last edited by guvnerwl; Sep 15, 2005 at 10:10 PM.
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Originally Posted by carbster09
However the shop has had a number of cam failures, therefore the roller cams are perferred.
carbster
carbster
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Originally Posted by guvnerwl
Crane custom hyd.roller
256/264 duration at .050"
.632"/.632" lift with 1.7 rockers
114 degree lobe separation
Jesel SS shaft rocker system, BBC 1.7 ratio
Callies Pro Magnum 4.250” crankshaft
peaks at 6300 rpm
256/264 duration at .050"
.632"/.632" lift with 1.7 rockers
114 degree lobe separation
Jesel SS shaft rocker system, BBC 1.7 ratio
Callies Pro Magnum 4.250” crankshaft
peaks at 6300 rpm
